Perspective drawing instrument



April 29, 194-7.

G. M. NOS SER PERSPECTIVE DRAWING INSTRUMENT Filed Sept. 20, 1945 2 Sheets- Sheet 1 r l IN VEN TOR.

eoxoou mmos ssa April 29, 1947. M N SSER 2,419,725

PERSPECTIVE DRAWING INSTRUMENT Filed Sept. 20, 1945 2 Sheets-Sheet 2 I & -10

F1 7 4. 4 A 3 224fif 50 r "Q" av 'INVENTOR. GORDON M. NOSSER,

ATI'DRNEYS Patented Apr. 29, 1947 UNITED STATES PATENT OFFICE PERSPECTIVE DRAWING INSTRUMENT Gordon M. N osser, Highland, Calif. Application September 20, 1945, Serial N 0. 617,494

3 Claims.

This invention relates to a perspective drawing instrument.

An object of the invention is to provide an instrument that will make true perspective drawings by the use of extending lines to a vanishing point.

Another object of the invention is to provid a device that will make it possible to have vanishing points at any distance from the drawing board making it possible to show true perspective.

A further object of the invention is to provide a device that can produce perspectives at any angle on the board.

With these and other objects and advantages in view the invention consists of the novel details of construction hereinafter more fully described and claimed and illustrated in the accompanying drawing in which Figure 1 is a top plan view of an embodiment of the invention.

Figure 2 is a sectional view on the line 2-2 of Fig. 1.

Figure 3 is a sectional view on the line 3-3 of Fig. 1, and

Figure 4 is a sectional view on the line 4-4 of Fig. 1.

Referring more in detail to the drawing the reference numeral l designates a conventionaldrawing board of any shape or size with which the invention is cooperatingly used.

The invention comprises a conventional T- square l2 having the head l4 and blade I 6.

The blade H5 at the end thereof is provided with elongated slots l8 and adjacent the head I4 is provided with a plate 28 having elongated slots 22.

Rails 24 and 26, respectively, are positioned crosswise on the blade I4, are pivoted at their crossing point 28, and have their opposite ends adjustably connected to the slots I8 and 22 by means of the wing bolt 38.

1A slide 32 comprising a face plat 34 having depending sides 36 is slidably mounted on the blade l6 for longitudinal adjustment thereon and has levers 38 pivoted thereto by means of rivets 48. The levers 38 are split at 42 at one end thereof and a bolt 44 extending through the ends transversely thereof will when tightened retain the levers in fixed position.

The opposite ends of the levers are curved at 2 46 and contact the inner edges of the rails 24 and 26 respectively. Contact being maintained between the levers and rails by means of curved springs 48 which bear against the levers and force them into contact with the rails.

Arms 50 connected to the levers 38 at an angle thereto are adopted to have their angular relation with the blade l4 changed by longitudinal movement of the slide 32 and slots 52 in the sides 36 permit movement of the arms 58 and levers 38.

As the T-square I2 is moved from side to side of the drawing board I 0 the angles formed by the arms 50 will change in proportion with the movement thereof.

As the T-square is moved from side to side a pin 54 connected to the cam 56 which is pivoted on the head l4 at [2 slides in the channel rail 58, which is pivoted at its end 68 to the board I0 at 62 the end 64 thereof being adjustably connected to the slotted guide bracket 66 by wing bolt 68. The pin 54 as it moves in the rail 58 will actuate the cam 56 which is in contact with an inclined bar 18 connected to the plate 28. This action will change the angular relation of the rail 58 and the rails 24 and 26, thus lines drawn along the arms 58 will always pass through the vanishing post regardless of the position of the slide 32 and its associated parts.

By adjusting the angular relation of the rails to each other and the angular relation of the rail 58, the vanishing point might be varied from any point on the board to an indefinite distance from the board.

It is believed that the operation of the device whereby the vanishing point of two angular lines is obtained will be clear to those skilled in the art from the foregoing description and it is to be understood that modification and changes may be made in the minor details of construction arrangement and combination of parts without departing from the spirit of the invention or the scope of the appended claims.

Having thus described the invention what is claimed as new and desired to be secured by Letters Patent is:

1. In a device of the character described the combination with a drawing board of a T square having pivoted rails adjustably mounted thereon, a slide mounted thereon for longitudinal adjustment with relation to the blade of said T-square,

3 arms connected to said slide at an angle thereto and means connected to said slide and wanting with said rails to change the angular adjustment of said arms, whereby lines drawn along said arms can be extended to a vanishing point on said board or at an indefinite point therefrom.

2. The invention as in claim 1 wherein means mounted on said board and coacting with said T- square will correct the angular adjustment of said arms with relation to said T-square.

3. The invention as in claim 1 wherein the means for changing the angular adjustment of said arms comprises levers pivotedly mounted on said slide and adapted to contact the: inner side of said rails.

GORDON M. NOSSER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 222,271 Hamilton Dec. 2, 1879 335,853 Thompson Feb. 9, 1886 2,190,404 Hastings Feb. 13, 1940 1,780,506 Rutquist Nov, 4, 1930 1,807,237 Postels May 26, 1931 

